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System Monitor Requires Restart

Provides CPU usage and memory usage graphs on the toolbar.

Rated 4 out of 5 stars (13)
0 users

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Works with Thunderbird 10.0 - 24.*
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Window Master

Functionality for multiple screens and windows. Easily open links in other windows or on other screens, move or merge tabs, and move or merge entire windows. With graphical controls for grid positioning.

Rated 4 out of 5 stars (23)
2 users

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Works with Thunderbird 35.0 - 54.0
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Reply Monitor Requires Restart

**This is NOT COMPATIBLE with Thunderbird 31 or newer versions**
Keep track of your emails and replies (Lightning is required).
Note: the name of this add-on has been changed to Reply Monitor because the previous name is a registered trademark.

Rated 4 out of 5 stars (21)
1 user

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Works with Thunderbird 38.0 - 52.*
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WebChanges Requires Restart

Monitor website changes for all websites not providing feeds.

Rated 3 out of 5 stars (1)
0 users

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Works with Thunderbird 3.0 - 24.*
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